package socket3;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

public class Server {
    private ServerSocket serverSocket;
    private List<PrintWriter> allout = new ArrayList<>();

    public Server(){
        try {
            System.out.println("正在启动服务器端");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务器启动完毕");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }

    private void start() {
        try {
            while(true){
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();

                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.setName(socket.getInetAddress().toString());
                System.out.println("一个客户端连接了"+t.getName());
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;
        public ClientHandler(Socket socket){
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }

        public void run(){
            PrintWriter pw = null;
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out,StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw,true);

                synchronized (allout) {
                    allout.add(pw);
                }

                sendMessage(host+"上线了，当前人数:"+allout.size());

                String message;
                while((message = br.readLine())!=null){
                    System.out.println(host+"说:"+message);
                    sendMessage(host+"说："+message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }finally {
                synchronized (allout) {
                    allout.remove(pw);
                    sendMessage(host+"下线了，当前人数"+allout.size());
                    try {
                        socket.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

        private void sendMessage(String message){
            synchronized (allout) {
                for(PrintWriter o:allout){
                    o.println(message);
                }
            }
        }
    }
}
